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#ifndef STATEMENT_H
#define STATEMENT_H
/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <boost/current_function.hpp>
#include <sstream>
namespace qpid {
namespace log {
/** Debugging severity levels
* - trace: High-volume debugging messages.
* - debug: Debugging messages.
* - info: Informational messages.
* - notice: Normal but significant condition.
* - warning: Warn of a possible problem.
* - error: A definite error has occured.
* - critical: System in danger of severe failure.
*/
enum Level { trace, debug, info, notice, warning, error, critical };
struct LevelTraits {
static const int COUNT=critical+1;
/** Get level from string name.
*@exception if name invalid.
*/
static Level level(const char* name);
/** Get level from string name.
*@exception if name invalid.
*/
static Level level(const std::string& name) {
return level(name.c_str());
}
/** String name of level */
static const char* name(Level);
/** Syslog priority of level */
static int priority(Level);
};
/** POD struct representing a logging statement in source code. */
struct Statement {
bool enabled;
const char* file;
int line;
const char* function;
Level level;
void log(const std::string& message);
struct Initializer {
Initializer(Statement& s);
~Initializer();
Statement& statement;
};
};
///@internal trickery to make QPID_LOG_STRINGSTREAM work.
inline std::ostream& noop(std::ostream& s) { return s; }
///@internal static initializer for a Statement.
#define QPID_LOG_STATEMENT_INIT(level) \
{ 0, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, (::qpid::log::level) }
///@internal Stream streamable message and return a string.
#define QPID_LOG_STRINGSTREAM(message) \
static_cast<std::ostringstream&>( \
std::ostringstream() << qpid::log::noop << message).str()
/**
* Macro for log statements. Example of use:
* @code
* QPID_LOG(debug, "There are " << foocount << " foos in the bar.");
* QPID_LOG(error, boost::format("Dohickey %s exploded") % dohicky.name());
* @endcode
*
* All code with logging statements should be built with
* -DQPID_COMPONENT=<component name>
* where component name is the name of the component this file belongs to.
*
* You can subscribe to log messages by level, by component, by filename
* or a combination @see Configuration.
*@param LEVEL severity Level for message, should be one of:
* debug, info, notice, warning, error, critical. NB no qpid::log:: prefix.
*@param MESSAGE any object with an @eostream operator<<, or a sequence
* like of ostreamable objects separated by @e<<.
*/
#define QPID_LOG(level, message) \
do { \
static ::qpid::log::Statement stmt_= QPID_LOG_STATEMENT_INIT(level); \
static ::qpid::log::Statement::Initializer init_(stmt_); \
if (stmt_.enabled) \
stmt_.log(QPID_LOG_STRINGSTREAM(message)); \
} while(0)
/**
* Macro for complicated logging logic that can't fit in a simple QPID_LOG
* statement. For example:
* @code
* QPID_IF_LOG(debug) {
* message = do_complicated_stuff;
* QPID_LOG(debug, message);
* }
*/
#define QPID_IF_LOG(level)
}} // namespace qpid::log
#endif /*!STATEMENT_H*/
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